US5583639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for checking the flatness and smoothness of a surface
Assignee: Sandvik AB
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Filing: 1993-03-11
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Granted: 1996-12-10
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Expires: 2013-03-11
Abstract
Abstract Device for checking of flatness and smoothness of an item (10) comprising components for measuring of flatness with an interference method and for measuring of smoothness with a reflection method, where the item (10) or a mirror (23) close to the item can be tilted in two directions until stripes of an interference pattern created on a first image plane (14) have a predetermined distance and a predetermined general direction, the deviations from flatness being calculated from the distance and curvature of the stripes, and the smoothness being calculated from the brightness variations in the mirror image created by the reflection method on a second image plane (22).
Inventors
- 👤 Tomas Rostvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:12
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/306
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
67 words
A device for checking flatness and smoothness of a surface of an item comprising: means for measuring the flatness with an interference method; means for measuring the smoothness with a reflection method; and means for orienting the item with respect to a reference plane in accordance with a distance and general direction of stripes created by the interference method before determining the smoothness with the reflection method.
Claim 2
Independent Claim
67 words
A device for checking flatness and smoothness of a surface of an item comprising: means for measuring the flatness with an interference method; means for measuring the smoothness with a reflection method; and means for orienting the item with respect to a reference plane in accordance with a distance and general direction of stripes created by the interference method before determining the smoothness with the reflection method.
Claim 3
Dependent Claim
41 words
The device according to claim 1, wherein the orienting means include means to tilt the item in two directions until stripes with a predetermined distance and a predetermined general direction are created on a first image plane by the interference method.
Claim 4
Dependent Claim
20 words
A device according to claim 2, wherein the number of stripes created by the interference method being at least two.
Claim 5
Dependent Claim
24 words
The device according to claim 3, further comprising means for automatic measuring of distance and direction of the stripes on the first image plane.
Claim 6
Dependent Claim
29 words
The device according to claim 1, wherein the measuring is done against a virtual image which is a mirror image in a mirror of the item to be checked.
Claim 7
Dependent Claim
45 words
A device according to claim 5, further comprising means for tilting the virtual image by tilting in at least one direction of the mirror reflecting the item, until stripes with a predetermined distance and a predetermined general direction are created on a first image plane.
Claim 8
Dependent Claim
48 words
The device according to claim 6, further comprising means for automatic measuring of the distance and general direction of the stripes on the first image plane and a mechanism for tilting the mirror in response to the measurement results until the stripes have the predetermined distance and direction.
Claim 9
Dependent Claim
24 words
The device according to claim 2, wherein the components for measuring with an interference method comprise a laser light source and a reference surface.
Claim 10
Dependent Claim
44 words
The device according to claim 2, wherein the components far measuring with an interference method comprise a laser light source, a reference surface and means for measuring the distance and general direction of stripes in an interference pattern created on a first image plane.
Claim 11
Dependent Claim
26 words
The device according to claim 2, wherein the components for measuring with a reflection method comprise a high intensity light source and a second image plane.
Claim 12
Dependent Claim
24 words
The device according to claim 5, wherein the components for measuring with an interference method comprise a laser light source and a reference surface.
Claim 13
Dependent Claim
44 words
The device according to claim 5, wherein the components for measuring with an interference method comprise a laser light source, a reference surface and means for measuring the distance and general direction of stripes in an interference pattern created on a first image plane.
Claim 14
Dependent Claim
26 words
The device according to claim 5, wherein the components for measuring with a reflection method comprises a high intensity light source and a second image plane.
Claim 15
Independent Claim
65 words
A method for checking flatness and smoothness of a surface of an item, comprising the steps of: measuring the flatness of the surface with an interference method; orienting the item with respect to a reference plane by using a distance and general direction of stripes created by the interference method; and after orienting the item, measuring the smoothness of the surface with a reflection method.
Claim 16
Independent Claim
65 words
A method for checking flatness and smoothness of a surface of an item, comprising the steps of: measuring the flatness of the surface with an interference method; orienting the item with respect to a reference plane by using a distance and general direction of stripes created by the interference method; and after orienting the item, measuring the smoothness of the surface with a reflection method.
Claim 17
Dependent Claim
30 words
The method of claim 14, wherein the orienting step includes tilting the item in two directions until the stripes have a predetermined distance and direction on a first image plane.
Claim 18
Dependent Claim
14 words
The method of claim 14, wherein a virtual image in a mirror is measured.
Claim 19
Dependent Claim
22 words
The device according to claim 1, wherein the orienting means orients the item to maintain the stripes in a substantially horizontal position.
Claim 20
Dependent Claim
19 words
The method of claim 14, wherein the item is oriented to maintain the stripes in a substantially horizontal position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-10 | 2000-06-10 | 2000-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-10 | 2004-06-10 | 2004-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-10 | 2008-06-10 | 2008-12-10 | $7700.00 | Window Closed / Lapsed |